Compression-pump



` 2 sheets-sheen 1. W. F. DAVIS. GOMPRESSION EUMP.

(No Model.)

No. 497,092 Patented May 9, 1893.

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GOMPRBSSION PUMP.

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A m, L 6. a w M /W o. JW N .d M wm@ d UNITED STATES PATENT OFFICE.

VILLIAM F. DAVIS, OF KANSAS CITY, KANSAS, ASSIGNOR OF ONE-FOURTH `TOROBERT I-I. DAVIS, OF RAYMOND, NEBRASKA.

COMPRESSION-PUMP.

SPECIFICATION forming part of Letters Patent No. 497,092, dated May 9,1893.

Application tiled November 16 1891. Serial No. 412,013. (No model.)

To all whom t Hwy concern,.-

Bet known that I, WILLIAM F. DAVIS, residing at Kansas City, in thecounty of Wyandotte, State of Kansas, have invented certain new anduseful Improvements in Compression-Pumps, of which the following ishereby declared to be a full, clear, and exact description, sufticientto enable others skilled in the art to which such invention appertainsto make and use the same.

The invention relates to compression pumps, such, for example, as areused to condense the volatile refrigerant employed in icemaking plants,and in breweries, packinghouses, dac., and the object is to improve thestructure of the pump and to provide efficient means for oiling thecylinder, and for saving the surplus lubricant.

The nature of the improvements will appear from the descriptionfollowing and be thereafter more distinctly pointed out by claims at theconclusion thereof.

In the accompanying drawings, which form part of this specification,like features of structure are designated by like reference symbolsthroughout.

Figure l is a view of the improved pump and surplus oil trap inlongitudinal section; the oil supply pump for the main cylinder beingshown in elevation. Fig. 2 is a side elevation view of the oil trap, itsoutlet cock being shown in longitudinal section on line l--l Fig.1. Fig.3 is a detail view of the main piston and its rod, in centrallongitudinal section. Fig. 4 is a-view of the piston head in transversesection, online 4-4 of Fig. 3. Fig. 5 is a section View of the pistonshowing the oil feed ports and control valve, on line 5 5 of Fig. 4.Fig. 6 is a View of the oil supply pump in central longitudinal section.

Mounted upon the upright frame or standards A is the compression pump Bhaving water-jacket b surrounding its cylinder, as well understood, toaid in reducing temperature. The pump B is operated in the usual mannerby means of the connecting rod a driven from the steam-engine or otherlordinary source of power. The connecting rod a is united by wrist pin c,to the cross head CZ, which latter moves and is guided as usual in theopposite ways or channels of the frame A. The piston-rod C is connectedat its outer end as usual, to the cross-head d, and at its inner endcarries the piston D. Instead of being solid, the rod C is furnishedwith a tubular bore or channel which extends centrally therein, from thecross-head CZ to the interior of the piston D. The piston D is furnishedinternallywith a longitudinal chamber which snugly receives and seatsthe valve e having stems f at opposite ends thereof which project for aslight distance beyond the the faces of the piston. Leading out from thevalve-chamber e are the ducts g which open into the tubular piston-rodC, said ducts being located apart at a distance sufiicient to allow freeventage from the tubular piston rod to the valvechamber through one ofthe ducts, while the other is closed by the valve e. From the valvechamber e', on opposite sides, lead the reverse feedducts h h whichdischarge at the upper and lower rims of the piston respectively. InFigs. 3 and 5 of the drawings, the control valve c is shown in theposition it maintains during the upward stroke of the piston. As thepiston nears the end of such stroke, theprojecting pintle of the valve ewill contact with the end of the pump cylinder, thus reversing thevalve, and establishing the lower ducts h in communication with thevalve chamber and the hollow piston-rod. By this provision the supply ofoil is discharged at the rim ofthe piston directly in the lead of itsadvance, and whether upon the forwardstroke or in reverse. An abundantsupply of lubricant is thus provided at the piston, so that the rapiddrying and heating of the cylinder due to the compression of thecirculating agent, will not impair the efficiency of the piston which iskept constantly lubricated by means of the fresh iow of oil which itreceives during each stroke.

The compression pump Bis furnished with the companion inducts 7l andeducts Z which are united respectively to the feed-pipe lc, anddischarge pipe m,i`n closed connection withthe other parts of therefrigerating system. The pump B has the usual heads secured inconvenient manner to the pump cylinder, and carrying the induct andeduct valves. The cylinder heads are bored to receive the cagesn of theseveral Valves, each cage being furnished with a hardened steel seat oscrewed thereto,

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and serving to receive the head p of the valves. The ledges or insets ofthe cylinder heads are made at nearly the same distance apart as theledges of the cage n so that a gasket of lead or other material can beslipped over the cages, and serve to close the/joint between the cagesand head when the former are set in place, by means of the cross bar qand set-screws fr. Tho valves are of ordinary pattern, having the headsp carried by stems s, sustained within guides t of the cages, and heldin place by means of the reaction springs.

The excess oil which escapes from the main cylinder passes in companywith the condensed refrigerant or other circulating agent by the commoneduct m, to the dome E of the trap or receiver F. A pipe G is tappedthrough the dome E, and communicates with the curtain H which serves asa screen for the mixed oil and agent, and permits the latter to proceedto its reservoir by pipe G, while the oil is separated and drops fromthe dome E into the closed trap F. Through an off-set at one side of thetrap F extends an outlet cock 10 tightly secured as shown, in the wallof the trap F, and furnished externally with an elbow coupling G fittedthereto, and discharging at its outer end into the open cup Il.

, The coupling G is furnished with a stem valve 11 which closes againstits proper seat to obstruct the longitudinal Vent of the cock 10.

WVithin the tiap F is a hollow float I perforatedv or open about itstop, as shown, and having an outlet tube 12 at the bottom thereof whichis coupled, as at 13, about the body of the cock 10, and is free toswivel for aliniited distance thereon. A cross vent 14 in the cock 10,coincides at times with the mouth of the tube 12, and thus establishesfree communication between the interior of the trap F, and the cup H.

When the compression pump is first operated, the stem valve 11 of thecoupling G is closed againstits seat and so remains until the excess oilin trap F accumulates in sufficient volume to lift the oat I against thestop 15, and thereafter until the oil passes by hole 16 into the floatcan and weights the same sufciently to further submerge it in the oil ofthe trap F. The stem-valve 11 is thereupon opened and the oil which hasaccumulated in the can I flows at once through the cock 10 and couplingG to the cup I-I, which being open to the air permits the oil to coolrapidly. The pressure of the main pump B expedites the flow of oil, butas the overflow-can I is gradually emptied, the surrounding volume ofoil in the trap F, floats it higher so that when it rests against thestop 15, the cock 10 is closed, and the ventage of the condensed gas orlike circulating agent is prevented.

In the form shown by the drawings, the force feeder for the oil-supplyof the main cylinder, consists of a pump L of approved pattern, andwhich is attached at one side to the cross head CZ of the main pump. Aflexible hose M unites the inducts l?L (Fig. 6) of the oil pump with thesurplus cup Il. The piston rod 17 of the feed pump carries at its outerend a cross-lever 18 which, by link 19,is suspended from the cross-headd and atits opposite end is pvoted to ayielding spring actuator 20secured to a bracket 21 of the main frame. The inner end of the lever 18has an arc-like terminal described from the fulcrum 2l, as a center, bywhich expedient and its link suspender 19, the lever 18 bears snuglyagainst the cross-head d and is at the same time free to turn in limitedplay about its fulcrum 21. The outer end of the cross-lever 18 beingheld in practically constant position by the actuator 20, operates toeffect the reciprocation of the piston rod 17 in keeping with t-hemovements of the cross-head d; the right-line throw of the rod 17 beingassured by reason of the link connection 19 and the yielding actuator 2Oof the operating lever 18. The oil supply pump L injects the oil intothe main pump cylinder in unison with the movement of the main pistonand its rod C, so that for each stroke of the latter, the oil isdischarged portion-wise into the body of the main cylinder.

Obviously, the details of sti'ucture can be varied according to theskill of the mechanic without departing from the spirit of theinvention, which is not limited to the precise devices herein set forth.

Gaskets 30 of lead, or the like, are seated between the companion ledgesof the cylinder and its heads, and are snugly retained thereby so thatthey cannot be displaced whatever pressure is exerted in bringing theheads to gas tight position against the cylinder ends.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is-

1. The combination with the main-pump having a hollow piston-rod, of thelubricant pump opening into, mounted upon and travcling with, saidpiston-rod, and a stationary actuator to shift the rod and piston ofsaid lubricant pump during its reciprocating play, substantially asdescribed.

2. The combination with the main-pump having a hollow piston-rod, dualpiston ducts opening therefrom and a control valve to close said ductsalternately, of the supplemental or lubricant pump mounted upon andcommunicating with said hollow piston-rod and a stationary actuator toshift the piston rod of said supplemental pump, substantially asdescribed.

3. In compression pumps, the combination with the hollow piston-rod, ofa lubricant pump mounted and reciprocating therewith, said pump having ailexible supply tube, and a stationary spring actuator to determine thethrow of the feed-piston and its rod, substantially as described.

4C. The combination with the hollow pistonrod, of the lubricant pumpmounted and trav- IOO IIO

cling therewith, its reciprocating piston-rod, the cross-lever securedthereto, and the fixed spring arm pivoted to said lever, substantiallyas described.

5. The combination with the main pump having a hollow piston-rod, of thepiston-head having dual ducts opening at one side from said rod, and onthe other side discharging at opposite rims of the piston respectively,and

a control valve mounted Within said piston, 1o alternately closing theducts therein, and having stem terminals projecting beyond the faces ofsaid piston to reciprocate said valve, substantially as described.

t WILLIAM F. DAVIS. Witnesses: t

HUGH MATHEWS, JAMES W. HILL.

